Welding material and welding joint
There is provided a welding material used for welding of SUS310 stainless steel base metal that contains at least one of Nb and V and is excellent in intergranular corrosion resistance, the chemical composition of the welding material consisting, by mass percent, of C: 0.02% or less, Si: 2% or less, Mn: 2% or less, Cr: 26 to 50%, N: 0.15% or less, P: 0.02% or less, S: 0.002% or less, and Ni: a content percentage satisfying [5≤Ni≤Cr−14], and the balance of Fe and impurities. Also, there is provided a welding joint of an austenitic stainless steel, which consists of the base metal and a weld metal formed by using the welding material.
1. A welding joint of an austenitic stainless steel, consisting of:
a base metal of an austenitic stainless steel consisting, by mass percent, of C: 0.02% or less, Si: 0.01 to 0.5%, Mn: 0.01 to 2%, Cr: 24 to 26%, Ni: 18 to 22%, Mo: more than 0.10% and less than 0.50%, N: more than 0.04% and 0.15% or less, P: 0.02% or less, and S: 0.002% or less, and one or two elements of Nb: 0.30% or less and V: 0.40% or less, and the balance of Fe and impurities, and
a weld metal formed by using a welding material consisting, by mass percent, of C: 0.02% or less, Si: 2% or less, Mn: 0.51% or less, Cr: 32.10 to 50%, N: 0.15% or less, P: 0.02% or less, 5: 0.002% or less, and Ni: a content satisfying Formula (I), one or more elements selected from Mo: 1% or less, Nb: 0.5% or less, V: 1% or less, and REM: 0.05% or less, and the balance of Fe and impurities:
5≤Ni≤Cr−21.64 (I)
0.1≤Nb+V≤1 (II)
where each symbol of element in Formulas (I) and (II) represents the content (mass %) of each element contained in the welding material.
2. The welding joint of an austenitic stainless steel according to claim 1 , wherein
the welding joint is used for PLR pipe or a core material of a boiling water type nuclear power plant.
3. The welding joint of an austenitic stainless steel according to claim 2 , wherein the core material is a shroud.